maths memorization

What is the quadratic formula?

The quadratic formula is used to solve quadratic equations of the form ax^2 + bx + c = 0. It is given by: x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

How do you calculate the area of a triangle with no perpendicular height

Area=\frac12ab\sin C

Cosine rule (how to find a side)

a^2=b^2+c^2-2bc\cos A

Cosine rule (how to find an angle)

\cos A=\frac{b^2+c^2-a^2}{2bc}

Sine rule (finding a side)

\frac{a}{\sin A}=\frac{b}{\sin B}

Sine rule (finding an angle)

\frac{\sin A}{a}=\frac{\sin B}{b}

Equation of a straight line

y=mx+c

Arc length

\frac{angle}{360}\cdot\pi d

Area of a sector

\frac{angle}{360}\cdot\pi r^2

Density

\frac{mass}{volume}

What pieces of info do you need to give for describing enlargement

The word “enlargement”

Centre of “enlargement”

scale factor

What is the general equation of a circle centered on the origin

x^2+y^2=r^2

What is a geometrical sequence

A sequence that multiplies by the same value from term to term

What does the area under a velocity time graph represent

Distance travelled

What does the denominator of a fractional power represent

Root